issue multi-cor vs reconstruction

Seems like the reconstruction with multi-cor have a different 'field-of-view' more than expected.

For the configuration file here:nabu_issue_fov.conf (can also be found in '/tmp_14_days/payno/test_multi_cor') if we reconstruct a single slice then we end up with a reconstruction looking like:

But if we run the multi-cor over some COR values like

 nabu-multicor nabu.conf middle 2050:2070:5

Then we end up with reconstructions looking like:

There is some gradient and the reconstruction width seems very different ( vs 5100)

nabu	nabu-multicor